Hello,
Me and some of the colleagues are having a discussion about requesting electricty supplies from the Distribution Network Operator and stating the KVA rating of the supply.
The application is for street lighting, with the supply into a three phase feeder pillar, with circuits being...
Just about proceed doing some voltage quality analysis after the insertion of a CLR into a system ,however I thought it would be worth enquiring how others model this.
I was going to do it with the standard RLC component, with obviously R and C neglible/zero?
Any advice would be great on any...
Considering things like fault levels and the subsequent use of fault current limiters to combat high magnitudes I was wondering what issues does this introduce though?
Will having a big lump of resistance/reactance in the system will cause problems in the post-fault phase etc?!
This vaguely...
Depends on the wattage and light source in question, is it for street /highway lighting?!? If so....
100W SONT = 0.74A
250W SONT = 1.4A
400W SONT = 2.11A
600W SONT = 3.1A
This type of info is always murder to find on Manufacturers websites....
Manufacturers-
Urbis Lighting www.urbislighting.com
Philips
DW Windsor
WRTL
Thorn Lighting
Abacus
Package wise Lighting Reality is considered the best, but sayying that Urbis and Philips offer their own in house software programs called Turbolight and Calculux respectively. Both can do stuff...
Does anybody know of any education institutes/luminaire manufacturers that offer a decent tunnel lighting course around the u.k.Alternatively any material that anybody may have that they would gladly pass on, would be gladly received, to supplement the BS EN 13201:2003 material I have.
Many...
Sorry Guys,
Just looking for some clarification regarding when you undertake cordination calcs, which current quantity do you use i.e. asymmetrical pk, asymmetrical RMS, or symmetrical pk/RMS when your defining your maximum fault levels against the device curves on either log paper or...
Can any of yous guys offhand, suggest a solution to detect phase-phase faults on a Dd0 system, where the lowest fault current due to arcing resistance, no inductive contribution is lower than the actual load current at that point? Obviously you cant simply set the current pickup on a standard...
Cheers Dandel, the 1A secondary comes from the fact that im in the U.K, so basically what youre sayin is that as long as the relay causes the appropriate breakers to trip before the CT reaches the saturation level at which the CT sits down,CT indicative of normal load currents at that point of...
Just a quick question guys, the rule of thumb that says the a CT should maintain the linear relationship between the reflections of the CT ratio for up to 20*the rated primary current.Is this with regards to the asymmetrical peak or RMS values? i.e. if I had a bus protected by a OC relay with a...
Yes, sorry the MCB was a typo, the reason for the choice of Terasaki was due to having literature and having requested their in house discrimination software, guess it just being lazy is suppose on my part.The reason behind the question was detemine a minimum grading margin as such between...
Any anybody give me some guidelines on discrimination when using MCB's as the PRAG manuals from the usual suspects dont mention anything about these devices for some reason. I was looking to use Terasaki TemBreak Series to protect a couple of 440 LV buses with have prospective asymmetrical peaks...
Sorry in addition to the above post, just to clarify if you were using non-directional overcurrent highset overcurrent protection, im i right in saying that you would have to account for both situations i,e normal and reverse if carrying out the protection cordination studies? Just for future...
I was speaking to a colleague yesterday, when he mentioned that it is possible for a TX to have a greater inrush mutiplier when backfeeding through it, in order provide emergency measures.Has anybody else encountered this over there experience and any reason why it happens that the inrush...
